This October, Onyx Slots invites UK players to join the Haunted Halloween Leaderboard and compete for a slice of £250 in cash every week. Spin selected spooky slots and rank among the top 45 to win real money prizes credited in British pounds.
The promotion runs across five weekly periods between 1st October and 2nd November 2025 and requires a minimum bet of 10p on participating titles.
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Key details of the Haunted Halloween Leaderboard are summarised below for your convenience.
- Promotion dates: 1st to 5th, 6th to 12th, 13th to 19th, 20th to 26th October, and 27th October to 2nd November 2025
- Leaderboard mechanic: Players earn points from the highest win multiplier per spin on selected Halloween-themed games
- Participating games: Big Bass Halloween, Kingdom of the Dead, Book Of Monsters, Zombie Carnival, Wild Walker, Vampy Party
- Players ranked: Top 45 players each week receive prizes
- Minimum bet: 10p to qualify
- Prize pool: £1,250 total, £250 cash weekly pool
- Weekly prizes:
Rank Prize 1 £55 Cash 2 £30 Cash 3 £20 Cash 4 to 10 £10 Cash Each 11 to 20 £5 Cash Each 21 to 45 £1 Cash Each - Prize crediting: Winnings credited in £ within two working days after each tournament week ends
- Tiebreakers: The first player to reach a score holds the higher ranking
- Player eligibility: Only valid account holders aged 18 or over may participate
- Rules: No account manipulation, multiple accounts, VPN usage or gameplay exploitation allowed, technical issues may void rounds
For more insight into this operator’s offerings, you can take a look at our detailed write-up about the Onyx Slots bonus and features. This will help you understand the full player experience beyond the leaderboard event.
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Please remember to gamble responsibly. For support and advice, visit GamCare or call their free helpline at 0808 8020 133.
🎯 Mr. Gamble EXPERT TAKE
This Onyx Slots promotion is a classic leaderboard tournament where you climb the ranks by getting the highest win multiplier on select Halloween-themed slots. You’ll be competing with other players weekly to grab a share of £250 in cash. It’s spread out over five separate weeks, so you get plenty of chances to get a good spot on the leaderboard.
Leaderboards like this are pretty popular in the UK market, especially for seasonal events like Halloween. A minimum bet of 10p to qualify is quite player-friendly, so you don’t have to stake too much while trying to climb the ranks. Some tournaments require higher bets or restrict the number of spins, but here there’s no limit on rounds played which is a nice touch.
What’s cool is the prize distribution gives quite a few winners each week. The top player takes £55, which isn’t massive but it’s decent for this style of promo. Then players ranked 2nd to 45th still get cash from £30 down to £1. That spread is pretty common in UK casino leaderboards and it helps keep more players interested.
You’ll want to keep in mind it’s all about the highest multiplier, so landing a big win on a small bet can put you ahead. This is different from some other tournaments where total stake or total wins count. It means you can play smart with smaller bets but chase big multipliers.
This promotion is quite straightforward compared to others with wagering and bonus spins involved. There’s no wagering on your £ winnings, so whatever you win from the leaderboard is yours to keep. Onyx Slots also promises payouts within 2 working days, which is fairly quick by UK standards.
This is a great promo if you enjoy Halloween-themed slots and want the excitement of competing without too many strings attached. However, it’s not ideal if you prefer bigger jackpots or freerolls with bonuses you can play for free. Also, watch out for rules around manipulation and multiple accounts – they’ll disqualify you if you try anything dodgy.
Be aware you need to opt-in via a pop-up, so don’t miss that or your spins won’t count. Also make sure you’re playing the right games listed, as spins on other slots won’t help your leaderboard rank. If you’re happy with small stakes and some casual competition, this is definitely worth giving a shot this October.